A tuning fork vibrating with a sonometer having \( 20 \mathrm{~cm} ...

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A tuning fork vibrating with a sonometer having \( 20 \mathrm{~cm} \) wire produces 5 beats per second. The beat
\( \mathrm{P} \) frequency does not change if the length of the wire

W is changed to \( 21 \mathrm{~cm} \). the frequency of the tuning fork (in Hertz) must be
(1) 200
(2) 210
(3) 205
(4) 215
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